FUNDAMENTALS OF COMPUTER

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COMPUTER THREATS SECURITY

WHAT IS A FIREWALL IN NETWORK SECURITY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In addition to examining the header information of the packets traversing the firewall, this type of firewall considers other factors when determining whether traffic should be permitted across the firewall. It also determines whether a packet is part of an existing session, and that information can be used to decide whether to permit or deny a packet.
A
stateful inspection
B
stateless inspection
C
packet filter firewall
D
Chinese Great Wall
Explanation: 

Detailed explanation-1: -A proxy firewall (aka application-level gateway) inspects packets at the application layer of the Open Systems Interconnection (OSI) reference model.

Detailed explanation-2: -The first firewalls were packet-filtering firewalls that work at the Network layer of the OSI networking model. They examine the packet headers that contain IP addresses and packet options and block or allow traffic through the firewall based on that information.

Detailed explanation-3: -A stateless firewall operates at the OSI Network Layer (L3) and only looks at the header part of a packet.

Detailed explanation-4: -Stateful firewall filters − It is also known as a network firewall; this filter maintains a record of all the connections passing through. It can determine if a packet is either the start of a new connection or a part of an existing connection or is an invalid packet.

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